Spark-arrester.



No. 880,442. Y PATBNTBD PEB. 25, 1908. K. M. coLQUHoUN.

SPARK ARRBSTER. APPLICATION FILED MAY 22,1907.

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KENNETH M. COLQUHOUN, OF OWATONNA, MINNESOTA.

SPARK-ARRESTER.

S'peecation of Letters'Patent.

Patented Feb. 25, 1908:

Application filed May 22. 1907. Serial No., 375.162.

To all whom it may concern:

Be it known that I, KENNETH M. CoLQU- HOUN, of Owatonna, Steele county, Minnesota, have invented certain new and useful Improvements in Spark-Arresters, of which the following is a speciiication.

My invention relates to spark-arresters applicable to the smoke stacks of boilers generally but particularly adapted for use on threshing machine engines and Where lignite coal or strawv is used for fuel.

The invention consists generally in various constructions and combinations, all as hereinafter described and particularly pointed out in the claims.

In the accompanying drawings, forming part-of this speciiication, Figure 1 is a side elevation Jartially in section, of a boiler and stack with my invention applied thereto. Fig. 2 is a sectional view on the line x-:Jc of Fig. 1. Fig. 3 is a sectional view on the line @/-fy of Fig. 1.

In the drawing, 2 represents a boiler having an exhaust nozzle 3, and a stack 4.

5 is a circular plate having a central opening to receive the top of the stack and having a depending iiange 6 around said opening between which flange and the top of the stack a ring 7 is secured. Straps 8 extend up beside the stack upon the ange 6 and the ring 7, and the lower ends of said straps are connected by a ring 9, the ends of which are provided 'with a clamp device 10 for operating the ring snugly around the stack. The straps 8 extend above the top` of the stack and have inwardly inclined upper portions 11 which cross one another at the top of the arrester and are secured to the imperforate top plate 12 by a bolt 18. A ring 14 of substantially the same diameter as the top of the stack, is secured to the straps 8 and at the base of their inwardly inclinedportions, and a second ring 15 is provided near the top of the said straps, and between these rings a wire mesh 16 1s secured, forming a cone or hood over the top of the stack.

A pipe 17 has its upper end curved in to overhang the opening in the upper end of the cone and said pipe extends down beside the cone and into the stack, and has an open lower end near the nozzle 3. A considerable portion of the cinders blown up through the stack will pass into the cone and from thence be directed down the pipe 17 into the cinder box provided at the forward end of the boiler. The cover 12 is convex in form vide a series of circular screens spaced from one another and of sufficiently fine mesh to prevent the sparks or burning particles of coal or straw from being blown out of the and between it and the bottom plate 5 I prostack while the engine is in operation. I

may provide any suitable number of these screens. In this case I have shown three arranged one within another. The outer screen consists of an upper ring 18 and lower ring 19 connected by a filler 2O of suitable wire mesh. Vertical straps 21 connect the rings at intervals and have ears 22 formed on their ends that are detachably secured to the top and bottom of the arrester by bolts 23.

Vithin the outer screen, rings 24 and 25 are provided connected by a screen 26 and secured to the top and bottom of the arrester in the same manner as described with reference to the irst screen. The third screen is located within the second one and comprises rings 27 and 28 connected by a screen 29 and secured to the plates 5 and 12 in the same manner as' the other screens; The outer screen is permanently mounted, preferably, while the inner ones are capable of convenient attachment according to the character of the fuel that is being burned and the danger of rire from flying s arks. The rings 25 and 28 are adjusted a suA cient distance above the plate 5 so that any material passing through these screens and dropping down upon the plate will slide thereover under the rings and into the open top of the stack. The screens may be made of dierent mesh and by removing the top plate access may be had to them for removal or repairs.

This arrester is of very simple construction and can be readily applied to any type of stack and will positively prevent the discharge of sparks or burning embers and thereby eliminate all danger of fire around a threshing engine.

I claim as my invention:

1. `A spark-arrester comprising a late having an opening to receive the top o the stack andforming the bottom of the arrester, animperforate plate corresponding substantially in size to said bottom plateand forming the top of the arrester, rings arranged in pairs between said plates, and straps connecting the lower rings with the corresponding ones above them, said straps having ears Jformed thereon at their ends, and bolts detachably securing said ears to said plates and said lower rings being raised above thebottorn late to form an unobstructed passage on sai plate into the stack, a wire mesh arranged between each of the pairs of rings and secured thereto and said rings being arranged one within another on said plates and spaced apart and forming with the 'wire mesh a series of screens between the top above and spaced from said iirst named plate,

and a series of screens arranged at intervals between said plates and between the top of said stack and the peripheryT of said iirst named plate, and said screens being detachable whereby the number in use may be increased or decreased at will, substantially as described.

3. The combination, with a stack, of a plate having an opening to receive the top of said stack, a cone-shaped hood having a screen and supported over the open top of said stack, said hood having an open upper end, a pipe having a curved end tting within the open upper end of said hood and extending down within said stack, a plate covering the top of said hood, and screens inter osed between said iirst and second named p ates and inclosing said hood, substantially as described.

4. The combination, with a boiler having an exhaust nozzle and a stack, of a plate having a central opening to receive the top of said stack, a second plate, straps secured to the top of said stack and extending above the same and having inwardly inclined upper portions that are secured to said second plate, a screen inclosing the inwardly inclined portions of said straps and forming a cone shaped hood over said stack, a pi e leading from the top of said hood downward y and terminating near said exhaust nozzle, and a series of removable screens located between said first and second named plates and at intervals between the top oit' said stack and the peripheries of said plates, substantially as described. A

In witness whereof I have hereunto set my hand this 15th day of May, 1907.

Witnesses:

RICHARD PAUL, J. B. ERA. 

